Question

2016² x 2016^x-4.=2016⁷

 

Answer 1

2016² x 2016^x-4 = 2016⁷

2016^x-4 = 2016^7-2 = 2016⁵ 

=> 2016^x = 2016^5-4 = 2016¹ 

Ta suy ra x = 1

Answer 2

\(2016^2\times2016^{x-4}=2016^7\)

\(\Leftrightarrow2016^{x-4}=\frac{2016^7}{2016^2}\)

\(\Leftrightarrow2016^{x-4}=2016^5\)

\(\Leftrightarrow x-4=5\)

\(\Leftrightarrow x=5+4=9\)

    Vậy \(x=9\)

Answer 3

2016^x-4=2016⁷-2016²=2016⁵

x-4=5

x=5+4

x=9

vay x=9

Answer 4

2016² x 2016^x-4.=2016⁷

2016² x 2016^x-4 = 2016⁷

2016^x-4 = 2016^7-2 = 2016⁵ 

=> 2016^x = 2016^5-4 = 2016¹ 

Ta suy ra x = 1

 nhé !